System and method for processing raw sugarcane maximizing the preservation of policosanols during production of a shelf stabile potable cholesterol-reducing product

ABSTRACT

A method/process is provided for extracting and processing sugarcane juice from sugarcane stalks to produce a shelf-stable natural juice product preserving policosanols naturally-occurring in raw sugarcane sticks. The method includes steps of: providing sugarcane stalks having a high sucrose level; extracting sugarcane juice from the sugarcane stalks using a roller mill apparatus; filtering the extracted sugarcane juice through a screen filter; stabilizing the pH of the juice in a non-acidic solution of calcium hydroxide to a pH level in the range of 7.4 to 7.6; flocculating the sugarcane juice with a mixture of water and at least one natural flocculate product; evaporating the sugarcane juice to form a sugarcane juice concentrate having a Brix in the range of 50° Bx to 60° Bx; and extracting the sugarcane juice concentrate from the evaporator, while maintaining a maximum sugarcane juice temperature never exceeding 70° C. throughout the process.

FIELD OF THE INVENTION

The present invention pertains generally to sugarcane processing, and more particularly to the commercial processing of raw sugarcane to produce a stabile natural sugarcane juice product therefrom while maximizing the preservation of policosanols occurring naturally in raw sugarcane.

BACKGROUND OF THE INVENTION

The production of crystallized sugar from raw sugarcane is well known. Furthermore, the development of equipment and associated processes for producing sugar from sugarcane stalks has been extensive. Generally, sugar product is produced from a naturally occurring liquid contained within the cells of raw sugarcane stalks.

In many places throughout the world, and especially in Latin America, this naturally-occurring juice contained in the cells of sugarcane stalks is highly regarded as a beverage. In Latin America, this natural juice product is commonly referred to as “guarapo.” The term “guarapo,” which carries the unmistakable sonority of its Quechuan origin, has become part of the Spanish lexicon to identify and define arguably the most pleasant and truly popular beverage in South America. Fresh guarapo has long been regarded as a healthy beverage which, in addition to providing thirst-quenching refreshment, is believed to have attributes that improve and enhance sexual performance. In fact, songs written by grateful Latin Americans having firsthand knowledge of its gifts have become an integral part of Latin American folklore.

The present applicant, in his issued U.S. Pat. No. 6,245,153 (the entire contents of which are incorporated-by-reference herein) disclosed an improved method for processing raw sugarcane to produce a consumable sugarcane juice, which overcame significant shelf life limitations of then state-of-the-art sugarcane processing methods. Prior to applicant's prior patented invention, there were no known methods for efficiently producing a natural guarapo product having an adequate shelf life to support commercial distribution thereof. In his '153 patent, the present applicant teaches a novel method for producing a stabilized natural sugarcane juice product having an adequate shelf life to enable commercial distribution, which does not require the addition of unnatural chemical additives, such as acids, during juice processing.

Since the time of applicant's initial invention (i.e. as disclosed in applicant's '153 patent), there has been a dramatic increase in the occurrence of dangerously high blood cholesterol levels in humans. In fact, the Centers for Disease Control and Prevention (CDC) estimate that 73.5 million adults (31.7%) in the United States have unhealthy “low-density lipoprotein” or LDL cholesterol levels, which is well known to cause a host of health problems in humans. Furthermore, the CDC has indicated that less than one out of every three adults (or 29.5%) with high LDL cholesterol has the condition under control. People with high total cholesterol levels have approximately twice the risk of heart disease as people with ideal total cholesterol levels.

The pharmaceutical industry has addressed the high-cholesterol problem by continuing to develop a laundry list of cholesterol-lowering drugs known as “statins,” including those sold under the brand names LIPITOR, PRAVACHOLD, CRESTOR, ZOCOR, LESCOL and VYTORIN, to name just a few examples. Statins are a class of medicines that are used to lower blood cholesterol levels by blocking the action of an enzyme in the liver that is necessary for making cholesterol. Cholesterol is necessary for normal cell and body function, but above normal, or high, LDL and total cholesterol levels can lead to atherosclerosis, a condition where cholesterol-containing plaques build up in the arteries and block blood flow. By reducing blood cholesterol levels, statins lower the risk of chest pain (i.e. angina), heart attack, and stroke. However, there are numerous well-documented risks and side effects associated with such pharmaceutical statin drugs. Most people who take statins have undesirable side effects, including, but not limited to, headaches, pins-and-needles sensation, abdominal pain, bloating, diarrhea, nausea, and skin rashes. Furthermore, it has been found that some statin drugs may impair memory and increase the risk for development of cataracts, as well as cause more serious side effects such as liver failure and skeletal muscle damage. Additionally, a significant segment of the high-cholesterol population is advised against taking statins, including people with progressive liver disease, and pregnant and breast-feeding women (or those intending to become pregnant).

Concurrently, there has been an increasing awareness throughout the medical community that policosanol, a naturally-occurring ingredient of raw sugarcane, has shown growing promise as an effective remedy for the treatment of unhealthy elevated blood cholesterol levels in humans. Researchers have found that policosanols contained in raw sugarcane stalks are remarkably effective and very safe in reducing levels of low-density lipoprotein (LDL), a component of cholesterol that is known to cause a host of health-related problems at elevated levels in individuals. While policosanol is a naturally-occurring component of sugarcane it is completely unrelated to sugar, chemically speaking. Sugar and policosanol just happen to come from the same plant. The effectiveness of policosanol in the treatment of high cholesterol levels has proven to be so great that initial estimates of the recommended daily intake of policosanol required to efficiently and effectively reduce above-normal LDL and total cholesterol levels is miniscule.

Policosanol is a kind of alcohol. Actually, policosanol is the collective name for a group of eight related solid alcohols (long-chain primary aliphatic saturated alcohols), of which one specific compound, known as Octacosanol, is the most prevalent in the mixture extracted from sugarcane. Policosanol is known to improve blood lipids, and research studies documenting its highly beneficial effects on human cholesterol levels are continuing to be published. Myriad medical studies have shown that policosanol lowers low-density lipoprotein (LDL), commonly referred to as ‘bad cholesterol’ while increasing high-density lipoprotein (HDL), commonly referred to as ‘good cholesterol’. Additional benefits of policosanol for treating high cholesterol and a host of other health-related issues, as well as an in-depth description of how policosanol functions to provide such incredible health benefits is further described in an article entitled “Policosanol Improves Every Measure of Blood Cholesterol” (www.life-enhancement.com/magazine/article/710-policosanol-improves-every-measures-of-blood-cholesterol), the entire contents of which are incorporated-by-reference herein. Medical studies continue to support the contention that policosanol works better than synthetically-derived pharmaceuticals when it comes to treating high blood pressure.

Moreover, an additional benefit of policosanols is that they contain octacosanol, which has been found to have additional health benefits for treating insomnia due to stress, athletic performance and symptoms of Parkinson's disease, as well as having anti-cancer (e.g. reduced tumor growth) properties.

Consequently, the ability to efficiently and effectively process a highly-stable sugarcane juice product while maximizing the preservation of policosanols from raw sugarcane has the potential to provide a means of enabling individuals with high cholesterol levels to consume such a small daily quantity of such a product that the respective corresponding sugar intake would be well within the maximum sugar intake recommended by the World Health Organization (WHO), which has recommended a maximum daily sugar intake for adults of five percent (5%) of total daily caloric intake. For a normal weight adult, that is about 25 grams of sugar per day.

Unfortunately, the development of an efficient, repeatable, cost-effective commercial method for maximizing the extraction of policosanols from raw sugarcane during production of a stabile natural consumable sugarcane juice product has proven elusive. Accordingly, there has been a long felt, yet unmet, need for a repeatable, reliable and cost-effective method for processing raw sugarcane to produce a highly stabile policosanol-rich potable sugarcane juice product on a commercial scale. Such a method would provide a means for producing a natural cholesterol-lowering consumable product at such a low cost that it could be made readily available to all individuals, particularly the millions of people that currently do not have the financial means to afford existing pharmaceutical drugs. Furthermore, such a method would provide a healthy alternative to drugs manufactured by the pharmaceutical industry that are known to have negative health side effects.

Accordingly, applicant began experimenting with alternative sugarcane processing methods for producing a variant of his stabilized sugarcane juice that maximizes the preservation of the policosanols stored in the cells of the pre-processed raw sugarcane used to produce his shelf stable sugarcane juice. Following much experimentation, applicant has discovered a variation of the sugarcane processing method originally disclosed in his above-identified issued U.S. patent (U.S. Pat. No. 6,245,153), which overcomes the aforementioned challenges by providing a repeatable, efficient, and highly cost-effective process for the commercial production of a policosanol-rich, stable, consumable product from raw sugarcane.

SUMMARY OF THE INVENTION

The present invention relates to a method for processing a shelf stable sugarcane juice product from raw sugarcane, which preserves naturally-occurring policosanols found in raw sugarcane. The method incorporates a sugarcane juice extraction process which preserves the natural flavor of the juice, prevents natural fermentation of the processed juice and preserves the natural color of the juice. Furthermore, the method enables the bottling and long term storage of the policosanol-rich sugarcane juice product, which is adapted for producing large volumes of juice product for commercial distribution.

These and other objects are achieved by the method of the present invention. Initially, sugarcane juice is extracted from manually harvested high sucrose content sugarcane sticks using a roller mill tandem. Juice extracted from the first two mills is filtered and then stabilized at a pH of about 7.4 to 7.6 through the addition of Calcium Hydroxide. Subsequently, the juice product is heated from a temperature in the range of about 26.7 to 29.4° C., to a temperature not exceeding 70° C. Subsequently, the juice is subjected to a series of clarification processes in which the additives are preferably limited only to natural products. For instance, it is preferred that natural flocculates are used during the clarification steps. Subsequently, the juice product is concentrated through an evaporation step to form a juice concentrate. Subsequently, the concentrate is further clarified and further concentrated to a Brix of about 75+/−5 degrees.

These and other aspects, features, and advantages of the present invention will become more readily apparent from the attached drawings and the detailed description of the preferred embodiments, which follow.

BRIEF DESCRIPTION OF THE DRAWINGS

The preferred embodiments of the invention will hereinafter be described in conjunction with the appended drawings provided to illustrate and not to limit the invention, in which:

FIG. 1 is a schematic illustration of an exemplary implementation of a method for producing a consumable policosanol-containing sugarcane product, in accordance with the present invention;

FIG. 2 is a schematic illustration of a sugarcane juice clarifying apparatus that may be employed with the method of the present invention; and

FIG. 3 is a schematic illustration of an apparatus that may be used during juice clarification sub-steps of the process.

Like reference numerals refer to like parts throughout the several views of the drawings.

DETAILED DESCRIPTION OF EXEMPLARY IMPLEMENTATIONS

The following detailed description is merely exemplary in nature and is not intended to limit the described embodiments or the application and uses of the described embodiments. As used herein, the word “exemplary” or “illustrative” means “serving as an example, instance, or illustration.” Any implementation described herein as “exemplary” or “illustrative” is not necessarily to be construed as preferred or advantageous over other implementations. All of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure, which is defined by the claims. For purposes of description herein, the terms “upper”, “lower”, “left”, “rear”, “right”, “front”, “vertical”, “horizontal”, and derivatives thereof shall relate to the invention as oriented in FIG. 1. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the inventive concepts defined in the appended claims. Hence, specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting, unless the claims expressly state otherwise.

Referring now to FIGS. 1-3, the method of the present invention generally includes the following steps:

Sugarcane Selection:

Initially, it is preferable to select extremely sweet, soft and flavorful varieties of sugarcane which have substantially no acidic content. In particular, it is preferred that the raw sugarcane chosen for processing yields a sucrose level of at least 13.7 percent. It will be apparent to those skilled in the art of sugarcane processing, that numerous varieties of sugarcane meeting the preferred standards are available in various regions of the world. Well known examples of sugarcane varieties which work well with the process of the present invention include: CCSP2000 CENICANA COLUMBIA SAO PAOLO; CC8568 CENICANA COLUMBIA; CC8592 CINICANA COLUMBIA; MY74275 MAYAGUEZ; and POJ2878, to name just a few.

Sugarcane Harvesting & Transport:

In the majority of sugar mills around the world, burning the standing sugarcane to facilitate cutting and lifting for transport to the mill is common practice. Where mechanical harvesting is employed and equipment is used for both cutting and lifting, the step of burning is almost always required. Unfortunately, sugarcane burning introduces ash byproduct which alters the natural flavor of the sugarcane juice and cannot be entirely eliminated. Consequently, in the method of the instant invention it is absolutely imperative to avoid the step of burning, since this conventionally used step destroys policosanols and a primary purpose of the present method is the retention of such policosanols.

To avoid the need for sugarcane burning, it is preferred that the sugarcane chosen for use with the present invention is manually cut approximately two inches from the stool, removing all green and dry leaves. It is also preferable that the sugarcane tops, commonly referred to as “cogollos,” are cut off; thereby avoiding the introduction of their pasty taste which is difficult to eliminate in processing without the use of chemical additives. It is crucial that the cut cane stalks are not cleaned at this step because the majority of policosanols in raw sugar cane are contained within the outer portion (or cortex) as a wax containing upwards of 80 percent (80%) of the policosanols. Furthermore, if the cane is burned then the policosanols are evaporated, completely defeating the purpose of the invention. As described further hereinbelow, policosanol is extracted from the wax during subsequent rolling operations. Furthermore, for similar reasons, it is absolutely crucial that the temperature of the extracted product containing policosanols is never subjected to a temperature greater than 70° C. This is a crucial departure from conventional raw sugarcane processing, and would not occur to those skilled in the art since heretofore the preservation/retention of policosanols has not, prior to applicant's invention, been a consideration.

Once the sugarcane has been manually cut, the unwashed cut cane should be manually lifted into a vehicle for transportation to a processing facility. Avoiding mechanical harvesting provides the further benefit of avoiding the introduction of foreign matter commonly carried into the processing mill along with the sugarcane. The foreign matter, often comprising ten percent or more of the sugarcane weight, primarily consists of soil, sludge, ash, leaves, minerals and cane tops. The introduction of the aforementioned foreign matter has the undesirable effect of altering the natural flavor of subsequently extracted sugarcane juice.

Chopping & Juice Extraction:

The cut sugarcane stalks are initially transferred onto a conveyer table 10 (FIG. 2) where they remain unwashed, or are subjected to very minimal washing such that impurities are removed without removing any of the wax. This is highly significant and very different than conventional sugarcane processing wherein sugarcane stalks are washed thoroughly for removal of impurities (without regard to removing the wax). Subsequently, the sugarcane stalks are conveyed through a standard chopping apparatus 20 to reduce the stalks into smaller individual pieces for feeding through a series of roller mills.

Although sugarcane juice is extracted at each of the mill sites, in the process of the present invention it is preferred that the juice chosen for subsequent processing in accordance with the present invention is limited to quantities extracted during passage through the first two roller mills 30 of the series of mills. Subsequently, this juice is communicated to its own separate tank. The balance of the juice extracted by the remaining mills can be pumped into factory tanks for use with subsequent standard sugar extraction processes. It is important that the cane is milled at the lowest possible rate. In particular, the milling rate is preferably reduced to approximately 50 percent of the rate used during conventional sugar production. This reduced rate allows the milling equipment to run without stress (i.e. since not at full capacity) so the resulting product quality is maximized.

Conventional sugarcane juice extraction methods incorporate hot water maceration to aid in the extraction process. However, in the process of the present invention it is crucial to avoid the addition of hot maceration water to the first two mill sites 30, since hot water tends to dissolve natural waxes and minerals in the hard, outer cortex of the cane stalk—and this is where 80% or more of the policosanols are contained. Instead it is preferred that these components are left behind as part of the bagasse. Thus, the sugarcane should be macerated with clean—preferably treated—cool water. For example, it is preferred that the water used for maceration have a temperature within a range of about 25 to 50 degrees Celsius.

In addition to avoiding the commonly-used step of maceration, it is preferable to limit the head stock hydraulic pressure (i.e. between rollers) in the first two mills 30 to about 1,500 pounds per square inch (psi). Significantly, the limited head stock hydraulic pressure minimizes the undesirable extraction of natural waxes, ferrous compounds and other minerals from the cortex of the sugarcane, again, where a majority of the policosanol resides.

Macro-Particle Filtration:

Initially, the sugarcane juice extracted by the first two mills 30 is subjected to a standard filtration process 40 for removing macro-sized particles from the juice product, as is well known in the industry. For the purpose of the present invention, the term macro-sized particle is used to denote particles having an average diameter on the order of at least approximately 0.05 mm. Preferably, macro-particle filtration is accomplished by passing the juice extracted by the first two mills through a standard steel screen filter having about 300-400 openings/in², followed by passage through a standard vibrating screen filter having 0.05 mm diameter holes and a vibration frequency of approximately 800 vibrations/minute.

Initial pH Stabilization:

Once the macro-sized particles have been substantially removed from the juice, the juice is subjected to a pH stabilization step 50. Precise pH control of the sugarcane juice is critical. The standard procedure in sugar mills is to add Calcium Hydroxide (CaOH), also referred to as milk of lime, until the pH level of the limed juice attains a value in the range of 8.0 to 8.5. With known sugarcane juice processes, the pH level of 8.0 to 8.5 is maintained prior to subjecting the juice to a clarification process, such that the resulting pH level is about 7.0 following clarification.

In the method of the present invention, the quantity of Calcium Hydroxide added to the sugarcane juice is limited to an amount required to achieve a pH level within a range of about 7.4 to 7.6, and preferably about 7.5. Consequently, the quantity of Calcium Hydroxide additive is reduced relative to the quantity typically introduced using existing processes. This reduction is critical for maintaining the natural flavor of the sugarcane juice and the policosanol. In general, retaining the natural flavor of the sugarcane juice in the final product requires minimizing the quantity of juice additives such as Calcium Hydroxide during processing. Following the subsequently performed steps of heating 60 and clarification 70, the resulting pH level of the sugarcane juice product is maintained at approximately 7.4 to 7.6; optimal for retaining the natural flavors.

Heating:

Following the step of pH stabilization, the juice product is heated 60 from an initial temperature of approximately 26.7 to 29.4° C., to a temperature of approximately 70° C.; however, in the present case it is crucial that the temperature never exceeds 70° C. in order to prevent the loss of policosanols. Heating may be accomplished using a standard heating apparatus as is well known in the industry. For example, one well known type of juice heating apparatus adequate for use with the process of the present invention comprises a vertical or horizontally disposed steel cylinder having plates at opposite ends for supporting juice-communicating tubes therebetween. The flow of juice through the series of tubes is controlled by a series of baffles. Low pressure steam is communicated into the cylinder through a series of mechanical valves and connectors, arranged such that the steam is flowed through a specific path, minimizing the formation of non-condensable gas pockets. The condensate is typically extracted from a lower part of the cylinder via a steam trap.

Initial Standard Clarification:

Following the step of heating, the limed juice product is communicated to a standard clarification apparatus 70, as is well known in the industry. Significantly, as further described below, the present method deviates from the method described in applicant's previous process (i.e. U.S. Pat. No. 6,245,153) in that the Cachaza was discarded during the prior process. In the present method, the Cachaza is retained because it contains a concentration of policosanols to be preserved during the present process. Standard clarification includes the addition of any of a number of commonly-used industrial flocculates. For instance, CALGON CANE FLOC R-200 and STORKHAUSEN PRAESTOL are two examples of well-known industrial flocculates used for clarification. The flocculates attach to impurities in the limed juice and then descend to the bottom of the clarifying apparatus. With known processes, the flocculates are extracted through standard froth pumps, filtered using a standard filter such as an Oliver filter, and transferred into storage tanks for subsequent use in raw sugar production. However, in the process of the present invention the juice obtained following froth pump filtration requires further purification to retain the natural flavor of the sugarcane juice.

With known extraction processes, a quantity of non-sugar impurities is retained in the limed juice. The following table illustrates the non-removed impurities present in the limed juice following standard filtration.

TABLE 1 Impurities requiring additional filtration (mg/l) Organic non-sugars Waxy materials (total) 300-800  Waxy materials; hard sugarcane wax 20-50  Waxy materials; soft sugarcane wax 50-100 Waxy material; phosphates 5-15 Total Proteins 15-100 Gums 5-50 Inorganic non-sugar Cations CaO 100-500  MgO 10-80  Fe₂O₃ 5-30 Al₂O₃ 3-20 Organic Components Waxy materials 5-15 Protein non-sugars 8-15 Pentosans 3-10 Inorganic Components CaO 1-5  MgO 1-5  Fe₂O₃/Al₂O₃ 3-10 P₂O₅ 1-3  SiO₂ 1-2  Ash insoluble in Hydrochloric acid (clay & sand) 5-20 Very fine fiber (bagacillo) 15-150

Second Clarification:

In a second clarifying step 90, further clarification is accomplished using a novel clarifying apparatus to remove the majority of remaining non-sugar impurities in the limed juice. The general structure of the novel clarifying apparatus, designed for use with the process of the present invention, is explained in more detail below.

Preferably, natural agricultural flocculate is diluted with water and then added to the juice product in the novel clarifying apparatus. Examples of natural flocculates that can be used include: GUASIMO (GUAZUMA ULMIFOLIA LAMARK); BALSO (OCHOMA LAGOPUS SW); and CADILLO (TRIUMFETTA LAPPULA L).

Prior to being diluted, the natural flocculate is dried and ground into a fine powder. Preferably, the powdered flocculate is diluted with water to form a flocculate compound sufficient for removing remaining impurities in the juice. For example, Applicant has found success mixing 225 grams of any of the above natural flocculates in a tank holding 100 gallons of water. The flocculate mixture is subsequently injected 80 along with the juice into the clarifying apparatus. Applicant has found that 10 grams of flocculate per metric ton of juice provides adequate flocculation. The use of natural flocculates helps maintain the natural flavor of the sugarcane juice. The flocculate mixture combines with the remaining solids and other impurities suspended in the juice to form a glutinous froth, commonly referred to as Cachaza, which floats to the surface of the juice for easy separation.

Significantly, with the present process the Cachaza is not discarded because it contains a concentration of policosanols that are desired to be retained and preserved in the final product. The Cachaza is communicated to special clarifiers for further processing. In particular, the Cachaza is subjected to a vacuum press filtration process using a vacuum belt filter press, such as that the TECHNOPULP Vacuum Press Filter model VPB260 manufactured by Cordoba Filtration Technologies of Riberirao Preto, Sao Paulo, Brazil. An industrial filter press is a tool used in separation processes, specifically to separate solids and liquids. The process uses the principal of pressure drive, as provided by a slurry pump. A more in depth description of the operation and function of such a vacuum filter press may be found in the technical paper TRIALLING A TECHNOPUMP BELT PRESS FILTER AT PIONEER MILL (Proc Aust Soc Sugar Cane Technol Vol 25 2013), the entire contents of which are incorporated-by-reference herein.

Although not preferred, this step of the process can be carried out using any of a variety of commercially-available industrial flocculates, including, but not limited to: TALOFLOTE, manufactured by Tate & Lyle, Incorporated; PCS 3106, manufactured by Midland Research Labs; and QUEMIFLOC 900, AH 1000, AP 273, TB 2634, VH 1007, QUEMICLAR VLC, QUEMIFLOC 724, AH 1010, MPM 1032, and QUEMIFLOC SE, all manufactured by Quemi International, Incorporated. Furthermore, clarification can be carried out using any of a number of commercially available anionic and cationic flocculates.

Referring briefly to FIG. 2, the limed juice and flocculate mixture is injected into the bottom portion of the clarifying tank via conduit 202 controlled by valve 204. Subsequently, the mixture is directed into the tank through conduit extensions 205 an angle of approximately 45 degrees to effect circular rotation of the juice mixture in the tank. The lower section of the tank is provided with a steam coil 226 having a plurality of openings, preferably ⅛ inch (3.17 mm) in diameter, extending therethrough. The rate at which the steam is released should be just adequate to maintain a juice temperature of approximately 70° C. (but never exceeding 70° C.) and provide heat aeration to the juice to affect flocculate formation and flotation to the surface.

A bubble generating apparatus 208 is provided for enhancing the elevation of froth to the surface of the juice. The bubble generator has a vapor inlet 208 and valve 210 for controlling the flow of vapor into the generator. Vapor is released through openings 211 in the generator. A trap 220 is provided at the bottom of the tank for collecting heavy solids that are not carried to the surface. The trap is also used to empty the clarifying apparatus for cleaning.

Upper and lower sets of paddles, 236 and 230, respectively, are rotated at a rate of approximately 0.5 rotations per minute (rpm), by motor assembly 240. The lower paddles 230 produce a mild stirring motion which serves to gently stir the juice and effect flocculate formation. Impurity-rich foam froth is formed at the juice surface where it is subsequently skimmed by upper paddles 236 for removal through slurry conduit 224. Preferably, the upper paddles are provided with curved or bowed surfaces to force the froth over the blades. Purified juice product is received through openings 213 in conduit 214 for transport into overfill tank 242. The purified juice is subsequently communicated through conduit 218 for further processing.

Evaporation & Extraction:

Following clarification step 90, the juice product is subject to the step of evaporation 100. The juice product is transferred to an evaporation apparatus through a transfer conduit. A series of sugar mill evaporators are employed to incrementally increase the sugarcane juice concentration. Preferably the juice concentrate is subsequently extracted from the evaporators at a Brix of about 60 degrees. Although a significantly higher Brix is possible, this is the preferred Brix for the additional clarification step 120.

As used herein, the term degrees Brix, represented by the symbol ° bx (and alternatively referred to herein simply as “degrees”) is used to quantify the sugar content of an aqueous solution. More specifically, it is a relative density scale used in the sugar industry to indicate the percentage (%) of cane sugar (sucrose) by weight (i.e. grams of sucrose per 100 milliliters (ml) of solution). After clarification, the clarified juice is passed to the evaporators to obtain the syrup with a degrees Brix (° Bx) value of 55° Bx (+/−5° Bx). It is critical that during the evaporation step the solution never exceeds 70° Bx, in order to conserve the aforementioned policosanols.

The resulting syrup should have a pH in the range of about 6.0 to 6.4, and its color, if the prior steps were followed precisely, should not be more than 4500 IU. The measurement of sugar color is an important function of the laboratories of sugar refineries and raw sugar mills, and is also for users of refined sugar products. For example, the ATM X2 COLORIMETER, manufactured by Index Instruments Limited of Cambridgeshire, England is an instrument dedicated to this important quality control function. International Commission for Uniform Methods of Sugar Analysis (ICUMSA) recommend the use of 420 nm as the wavelength for color measurements of white and light colored products, and a wave length of 560 nanometers (nm) for darker sugars. The result is displayed in ICUMSA Color Units (IU) at the wavelength selected. The different types of flocculants should preferably be about double the amount normally used during conventional sugar cane processing. In particular, it is preferred that the amount of flocculants used (e.g. TETRAFLOC) during this step is double the amount of the instructions, since it works better. It is also preferable that the flow of the clarifiers does not exceed 0.25 (or 25%) of the flow rate normally used during conventional sugar cane processing.

Third Clarification:

Preferably, the juice concentrate is subjected to a further clarifying step 120. This step is identical to clarification step 90, with a few exceptions. Namely, the concentration of natural flocculate is reduced by approximately 50 percent. For instance, where natural flocculates are employed the flocculate can be introduced at about 5 grams of flocculate powder per metric ton of juice. At this step of the process, the juice is preferably maintained at a temperature of approximately 60° C. Following this clarification step, the guarapo juice concentrate is virtually impurity free; having a purity of approximately 99.9 percent.

Inversion:

Following a final clarification step, the clarified product is preferably subjected to an inversion step, wherein the product is communicated through a series of stainless steel tanks (e.g. three inversion tanks) in order to reduce the pH level of the product to about 4.4 to 4.8, using citric acid, phosphoric acid, or a combination of the two. Furthermore, it is preferred that the temperature is maintained within a temperature range of about 50° C. to 60° C. Once this temperature is reached, an enzyme is added at a rate of at least about 0.11 grams per gallon of product (although a greater amount of enzyme may be added without departing from the intended scope of the invention). For instance, we have found success using 0.25 grams of enzyme per gallon of product at 55 degrees Brix. For example, we have found success using INVERIME 488 (or, alternatively, INVERZIME 482 and INVERZIME 490), all manufactured by Proenzimas SA of Cali, Columbia. The agitation in the tanks should be constant for a period of about 30 hours, following a predetermined inversion curve continuously.

Vacuum:

Following clarification step 120, the concentrate, having a Brix of 60 degrees, is subjected to a vacuum step 120 for further product concentration wherein the Brix is increase to approximately 75 degrees. It will be apparent to those skilled in the art that this step can be performed with a commercially available sugar vacuum pan.

Cooling & Settling:

Following vacuum step 130, the sugarcane juice concentrate is pumped into tank 140 for cooling to a temperature below 54.5° C. The tank is provided with a conical bottom fitted with a small trap for solids. Once the sugarcane concentrate having a Brix of 75+/−5 degrees is adequately cooled, it can be packed for distribution. The resulting product has proven to remain shelf stable for a time period of at least six months, provided it has been maintained at a temperature below 24.5° C.

Referring now primarily to FIG. 1, the following is a list of elements associated with reference numbers that are not included in FIGS. 2 and 3 (Note: FIGS. 2 and 3 pertain to various sub-steps of the process described herein and relating primarily to the method described in applicants prior issued U.S. Pat. No. 6,245,123). The following additional elements are pertinent to the present method, which relates to a modification of the original process in order to preserve policosanols during processing of the raw sugarcane:

REFERENCE NUMBER: PROCESS STEP/ELEMENT

-   -   101: Preparation of Talodura Flocculant     -   102: Tetrafloc     -   103: Acid     -   104: Activated Carbon     -   105: Steam     -   106: Lime     -   107: Air     -   108: Water     -   109: Flocculent     -   110: Vacuum     -   111: Hot Water     -   200: Juice     -   201: Cachaza Deposit     -   112: Cachaza Disposal Tank     -   113: Tetrafloc     -   114: Acid     -   115: Lime     -   116: Hot Water     -   117: Flocculent     -   118: Activated Carbon     -   119: Steam     -   120: Air     -   121: Solids to Cachaza Tank     -   122: Acid and Yeast     -   123: Water and Steam     -   124-126: Steam     -   127: Packaging

To reiterate some of the modified features and characteristics of the method of the present invention that have enabled the applicant to achieve a highly effective, efficient and cost-effective means for the commercial production of a policosanol-rich version of applicant's sugarcane juice product:

The cane should be milled at the lowest possible rate. It is important that the grinding stop for at least one hour between the normal production and Sugar Cane Juice Concentrate in order to clean all the tanks and tubes to ensure that there is no contamination of the clean juice with the dirty, burnt juice residue (and for there to be a reduction in the level of the juice clarifiers.

Maceration

The cane has to be macerated with clean, preferably treated water; but, never in hot water because hot water generates leaching of non-sugars that cause discoloration, as well as waxes and other impurities, negatively impacting the crucial preservation of policosanols.

Clarification of the Juice

The pH level must be maintained within a range of about 7.4 to 7.6, which is a departure from conventional raw sugarcane processing. This is due to the cleanliness of the juice that comes from the mills.

Turbidity is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye, similar to some in air. The measurement of turbidity is a key test of water quality, or other fluid quality. The propensity of particles to scatter a light beam focused on them is now considered a more meaningful measure of turbidity in water. Turbidity measured this way uses an instrument known in the industry as a nephelometer, with the detector set up to the side of the light beam. More light reaches the detector if there are many small particles scattering the source of the beam than if there are relatively fewer particles. The units of turbidity from a calibrated nephelometer are called Nephelometric Turbidity Units (NTU). To some extent, how much light reflects for a given amount of particulates is dependent upon properties of the particles, such as their shape/geometry, color, and reflectivity. For this reason (and the fact that heavier particles settle quickly and do not contribute to a turbidity reading), a correlation between turbidity and total suspended solids (TSS) is somewhat unusual for each location or situation. In the present process, it is important that the turbidity is less than 80 NTU.

Clarification of the Cane Syrup

As used herein, the term degrees Brix, represented by the symbol ° bx, is used to quantify the sugar content of an aqueous solution. More specifically, it is a relative density scale used in the sugar industry to indicate the percentage (%) of cane sugar (sucrose) by weight (i.e. grams of sucrose per 100 milliliters (ml) of solution). After clarification, the clarified juice is passed to the evaporators in order to obtain the syrup with a degrees Brix (° Bx) value of 55° Bx (+/−5° Bx). It is critical that during the evaporation step the solution never exceeds 70° Bx, in order to conserve/preserve the aforementioned policosanols.

The resulting syrup should have a pH in the range of about 6.0 and 6.4, and its color, if the prior steps were followed precisely, should not be more than 4500 IU. The measurement of sugar color is an important function of the laboratories of sugar refineries and raw sugar mills, and is also for users of refined sugar products. For example, the ATM X2 COLORIMETER, manufactured by Index Instruments Limited of Cambridgeshire, England is an instrument dedicated to this important quality control function. International Commission for Uniform Methods of Sugar Analysis (ICUMSA) recommend the use of 420 nm as the wavelength for color measurements of white and light colored products, and a wavelength of 560 nm for darker sugars. The result is displayed in ICUMSA Color Units (IU) at the wavelength selected.

The different types of flocculants should be exactly double the amount normally used.

It is extremely important that the flow of the clarifiers should not exceed about 20% of the conventional clarifier flow rate, and that in the syrup the tetrafloc is approximately twice the amount conventionally used.

Clarification in the Refinery

In the melting tanks, it is preferably to apply twice the amount of active carbon normally used in order to decolor to the desired ranges and end up with a final product with the following characteristics:

Color: 2000 IU

pH Range: 6.2 to 6.4

Turbidity: less than 1400 IU

Brix: 55° Bx (+/−5° Bx)

This step is critical; it is the final step of filtration, and if done perfectly, there will not be any problems with the filtration. If not however, we will end up with too much color and the filters will get clogged rapidly.

The cane juice should come out with a bright glow. If it does not, then the turbidity was too high and this will cause a problem with the filters.

Filtration of the Sugar Cane Juice

In this stage of the process, it is preferred to incorporate double filtration with Sparkler type filters. The FIRST FILTRATION is done utilizing a layer of DICALITE 4187. This gives us a filtration of 1 micron. If the previous steps are done correctly we will have a flow of 20-25 cubic meters per hour, very similar to those of liquor produced at the refinery, maybe 20-30% less but otherwise an excellent rate of flow. The Brix of the syrup we are filtering should be 55+/−5. The SECOND FILTRATION is also done using a new filtering product called ECOSORB S-426, which not only does the same thing as DICTALITE, but also decolorizes through ionic exchange.

Inversion

We have found great success using three stainless steel inversion tanks, two of which are reconstructions, and a new one, all of which have the capacity of producing five containers at a time. The inversion must reduce the pH to within a range of about 4.4 to 4.8, using citric acid, phosphoric acid, or a combination of the two. The temperature must be within a range of 50° C. to 60° C. After this temperature is reached, we add in the enzyme we are using, which measures 0.11 grams per gallon of syrup (although we were using 0.25 grams per gallon of syrup) at 55 Brix. The enzyme we use is INVERZIME 488 (or, alternatively, INVERZIME 482 and INVERZIME 490), manufactured by Proenzimas SA of Cali, Columbia.

The agitation in the tanks has to be constant. It generally takes about 30 hours and we have found that it is crucial to follow the associated inversion curve continuously.

Concentration of the Juice

We have found that it is absolutely crucial that the temperature of the product never exceeds 70° C. during processing, in order to ensure preservation of the policosanols as previously mentioned herein. Through much experimentation we have found that exceeding this temperature results in burning of the product (and corresponding loss of policosanols). Again, we have determined that the ideal Brix for the syrup is 75+/−5.

While the preferred embodiments of the invention have been illustrated and described, it will be clear that the invention is not so limited. Numerous modifications, changes, variations, substitutions and equivalents will occur to those skilled in the art without departing from the spirit and scope of the present invention as described in the claims. 

What is claimed is:
 1. A method for producing a shelf stable sugarcane juice product from raw sugarcane, which preserves naturally-occurring policosanols in the raw sugarcane, the method comprising steps of: providing raw sugarcane sticks; extracting sugarcane juice from said sugarcane sticks; filtering said extracted sugarcane juice through at least one screen filter; heating said filtered extracted sugarcane juice from a temperature in the range of about 26.7° C. to 29.4° C., to a temperature not exceeding 70° C. clarifying said filtered sugar cane juice to achieve a resulting pH level within a range of 7.4 to 7.6; flocculating said sugarcane juice using a mixture consisting of water and at least one natural flocculate product; evaporating said sugarcane juice in an evaporator to form a sugarcane juice concentrate having a degrees Brix value within a range of 50° Bx to 60° Bx; and extracting said sugarcane juice concentrate from said evaporator, wherein during said method the temperature of said sugarcane juice is always maintained at a temperature at or below 70° C.
 2. A method as recited in claim 1, wherein said step of providing further comprises providing manually-harvested sugarcane sticks.
 3. A method as recited in claim 1, wherein said step of providing raw sugar cane sticks further comprises providing substantially acid-free sugarcane sticks having a sucrose level of at least about 13.7 percent.
 4. A method as recited in claim 1, wherein said step of extracting sugarcane juice further comprises passing said sugarcane sticks through a series of roller mills.
 5. A method as recited in claim 4, wherein said step of filtering comprises filtering sugarcane juice extracted from a first two of said series of roller mills.
 6. A method as recited in claim 1, wherein said step of passing said sugarcane sticks through said series of roller mills leaves behind policosanol-rich bagasse, fibrous matter from which said sugarcane juice has been extracted, the method further comprising preventing said sugarcane sticks from being subjected to hot water maceration, such that natural waxes and minerals in a cortex of said sugarcane sticks are maintained within said bagasse composition following said passage through said roller mills.
 7. A method as recited in claim 6, wherein said step of preventing said sugarcane sticks from being subjected to hot water maceration further comprises subjecting said sugarcane sticks to a water maceration step using water having a temperature within a range of about 25° C. to about 50° C.
 8. A method as recited in claim 1, wherein said step of stabilizing the pH of said sugarcane juice results in a sugarcane juice pH of about 7.5.
 9. A method as recited in claim 1, wherein following the step of extraction, said concentrate has a Brix of about 55 degrees.
 10. A method as recited in claim 2, wherein the step of manually harvesting said sugarcane sticks further comprises preserving substantially all policosanols contained within a cortex of said raw sugarcane sticks by preventing any cleaning of said manually harvested sugarcane sticks in order to maintain a policosanol-rich wax component of said cortex.
 11. A method as recited in claim 8, wherein the step of manually harvesting said sugarcane sticks further comprises preserving substantially all policosanols contained within said cortex by preventing said raw sugarcane sticks from being subjected to any burning operations.
 12. A method as recited in claim 1, further comprising a step of packaging said extracted sugarcane juice for human consumption.
 13. A method as recited in claim 12, further comprising steps of: separating policosanol-rich Cachaza from said manually-harvested sugarcane sticks for processing apart from said sugarcane sticks; communicating said policosanol-rich Cachaza to a vacuum press filtration process to extract policosanol-rich sugarcane juice therefrom; and combining said Cachaza-extracted policosanol-rich sugarcane juice with the sugarcane juice extracted from said sugarcane sticks prior to said step of packaging, wherein said Cachaza is not discarded until Cachaza-extracted policosanol-rich sugarcane juice has been extracted therefrom. 